A direct touch table-top display as a multi-user information kiosk: Comparing the usability of a single display groupware either by a single user or people cooperating as a group

► Compared the single and multi-user performance on a direct touch table-top display. ► Usability is affected positively in multi-user situation. ► Difference in usability arose in the earlier stages of the system use. ► Users tended to help each other mostly in the earlier stages of interaction.